Pump



my 31 1951 A. s'. SQBRG 2,562,584

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ARNOLD S SO ERG BY July 31,1951

Filed June 23, 1949 FIG. 3

A. S. SOBERG 2 Sheets-Sheet 2 Patented July 31, 1951 PUMP Arnold S.Soberg, Elmhurst, Ill., assignor to Sochris Development Company,Chicago, Ill., a corporation of Illinois Application June 23, 1949,Serial No. 100,900

9 Claims.

This invention is directed to new and useful improvements in pump of thetype wherein a cylinder and piston is positioned adjacent a source ofwater or liquid in the ground within a well casing llled with liquid andpressure is exerted on the liquid within the casing to depress thepiston and means are provided to return the piston to move liquid fromthe source upwardly.

The primary object of this invention is to provide such a pump of simpleconstruction wherein an air column is compressed on the downstroke ofthe piston to provide the means for returning the piston to startingposition when pressure against the water column is released.

Another object is to provide means for replacing' air in the columnshould it become depleted.

Still a further object is to provide such pump assembly that isrelatively inexpensive to manufacture, lighter in weight, and easy tomaintain due to its simplicity of design and freedom from mechanicalmeans for returning the piston to upper positions.

Other objects and advantages will become apparent from the'followingdetailed specifications: In the drawings: Y

Fig. 1 is a sectional view of a pump assembly embodying this inventionwith the piston in normal position.

Fig. 2 is a View similar to Fig. 1 but showing the piston in itsdepressed position.

Figs. 3 and 4 similarly illustrate another form of pump assemblyembodying this invention.

In detail, the well casing I is sunk in the ground to a source of liquidto be pumped. A cylinder 2 is suspended within the casing I adjacent thesource of the liquid by any suitable means, for example by means of anexpanded ring assembly 3, as described in my copending applicationSerial Number 767,673, led August 9, 1947. Cylinder 2 houses the pumpingmechanism which includes cylinder 4, which is a tube closed at its top 5but with bottom end open. Mounted on the top 5 is a rod 6 to which issecured a piston head 'I having irreversible outlet ports 8 withclosures 9 of the usual well known construction. Piston head 1 isprovided with suitable sealing means I 0 adapted to permit slidingmovement within cylinder 2 but to prevent leakage of liquid through headIwhen ports 8 are closed. Piston head 'I and cylinder 4 form a pistonreciprocally mounted within cylinder 2.

Rigidly mounted on the lower end of cylinder 2 is an arched cap assemblyII including an irreversible inlet port I2 with closure I3 of usual`well known construction, permittingliquidto enter cylinder 2 throughport I2 and aroundl the;

(Cl. 10B- 46) arched portion of I'I. Extending upwardly from assembly II is a hollow tube I 4 to the top of which is secured a sealing cup I5extending across cylinder 2 but permitting sliding relationshiptherewith without liquid or gas leakage. Thus cup I5 and tube I 4'form arigid piston within cylinder 4 which is slidably movable with relationthereto. Tube I4 extends through cup I5.

This pump assembly thus provides a liquid chamber IG open at the bottomby inlet port I2 and at the top by outlet ports 8. There is alsoprovided an air chamber I'I to which tube I4 connects providing an airconduit I8. A tube I9` chamber I7 so that when it falls below the de.termined minimum the valve 2I may be opened to replenish the supply.

Connected to the interior of casing I is a conduit 22 leading to apiston assembly 23 adapted to provide pulsating pressure to the liquidin the casing as is well known.

Leading from casing I is a conduit 24 connected to a liquid storage tank25 through pressure valve means 26.

In operation'the entire casing I, piston assembly `23 and chamber I6 arefllled with the liquid to be pumped, water. Piston 2l is moved from theposition in Fig. 1 to that in Fig. 2 to exert pressure on the column ofwater in the casing I. The pressure will depress the piston formed bypiston head 1, valve assembly 8, 9 and cylinder d from Fig. 1 positionto Fig. 2 position. During this downward movement outlet ports 8 areopened to permit movement through the water column. Chamber I6 isdecreased in volume and liquid is necessarily displaced through and toabove piston head 'I.v `Simultaneously the volume of air chamber I'I isdecreased to compress the air therein. As piston 2l returns to rstposition the pressure on the liquid column is released and the com?pressed air in chamber I'I forces cylinder t and its associated pistonhead l back to its Fig. 1 position. On its return, outlet ports 3 areclosed to move the liquid above it upwardly. Also on tlereturn movementvalve assembly I I opens to take in liquid to chamber IS. As liquid is`displaced from chamber I6,as described, the upper end of the thusaugmented liquidcolumn moves into conduit 24 through pressure valve 26to tank 25.

From time to time, as needed, air can be sup. p plied to air chamber I'Iby opening valve 2|. It..

is apparent that gas can be substituted for air without affecting theresults.

This pump assembly dispenses with heavy spring construction forreturning the piston 4 to upper position. Thus the assembly is of lessweight, not subject to spring breakage and less expensive to make. y

It is apparent that other means may be utilized to maintain thenecessary air pressure in chamber I1 such as, for example, a smallcylinder or` CO2 positioned in chamber I1 and provided with an automaticregulating valve that would function to admit CO2 to chamber I2 when thepressure fell below a certain minimum. Likewise, an air bladder can bepositioned in chamber I2 containing a supply of air and sealed againstloss.V K

An alternate embodiment of the invention is shown in Figs. 3 and 4wherein the well casing is indicated by reference character SI and theseal, corresponding to the ring assembly I3 oi Figs. l and 2, isindicated by reference character 32. Likewise a cylinder 33,corresponding to cylinder I6 of Figs. l and 2, is formed on its lowerend with an irreversible inlet port' 3l? with closure 35' which, whenopen, permits water to enter cylinder 33 around the arched portion 36.Arche'd vportion 36, unlike its counterpart II in Figs;

and 3, provides a support forl inner cylinder 31.

Mounted within cylinder 33 is piston assembly 38 provided withirreversible outlet ports 35i with vclosures 4U and depending piston rodfII. YYAt the .lower end of piston 4I is' piston assembly 42 slide'-ably mounted in cylinder 31. ibe provided, if desired, to prevent sandor other material from interfering with the operation of A shield 43 maypiston L32.

The operation of the modification shown in iFig's. 3 and 4 is asfollows:

On the downward stroke of the water column 'the piston and rod assembly38, 4I and 42 moves from the normal position shown in Fig. 3`to thejposition shown in Fig. 4, thereby compressing the vin volume and theliquid thus displaced passes lupwardly through ports`35; Simultaneouslythe :air inthe lower portion of cylinder '31 is com'- pressed.

When the downward'stroke of the' water column is completed and thedownwardV pressure thereon is released, the'compr'essed air'in cylinder:31 forces the piston assembly back' to the'initial position,illustrated4 in Fig.v 3. As this upward' movement takes place the valves4"`are'closed, thus lifting the water column, andthe valve-35 open todraw a fresh increment of water'into1` cylinder 33.

Air supply line M, correspondingV tol the' air tube I9 of Fig. 1, orsimilar expedients `such as hereinabove described may be employed tomain-j tain the desired air pressure'in cylinder 31.

I claim:

l. A pump assembly comprising a cylinder 'having an open upper end, anirreversible inlet 4at its* lower end, a rod extending upwardly'fromthej lower end and terminatingbelowtheupper end,A a sealing cup on theupper end vvo said rod, a' movable piston assembly comprising-7asecond'cylinder with closed upperend Vslidably'1no1'.1ntedl around said cuprand extending abovesaid cup to provide an air chamber andbelow saidcup,its lowerend'being open,'a sealing-'cup "mounted on the upper end ofsaid second cylinder and in' 'I'li`L inl-a Wellcasing'ior 'operationbychanges in pres-VY sliding relation with the upper end of the firstcylinder, irreversible outlets in said second sealing cup, means formaintaining a predetermined pressure of air in said air chamber, saidassembly adapted for positioning within a well casing and its pistonassembly for reciprocation to move liquid upwardly. y y ,l

2. A pump assembly comprising an outer stationary cylinder, anirreversible inlet at the bottom thereof, an inner movable cylinderclosed at its upper end, a piston head secured to the inner cylinder andin sliding sealed relation with the outervcylinder to provide a liquidchamber between the two cylinders, an irreversible outlet through saidpiston head, a piston within the second cylinder and affixed to the nrstcylinder providing a closed air chamber within the second cylinderadapted to be decreased in volume by the downward movement of the innercylinder, said assembly being adapted for positioning withina wellcasing andV its movable cylinder to be reciprocatedY by variations ofpressure therein.

3. A pump assembly comprising an outer stationary cylinder, anirreversible inlet at the bottom thereof, an inner movable cylinderclosed at its upper end, a piston head secured to the inner cylinder andin sliding sealed relation with the outer cylinder to provide a liquidchamber between the two cylinders, an irreversible outlet through saidpiston head, a piston within the second cylinder and ainxed to theiii-st cylinder providing la closed air chamber within the secondcylinder adapted to` be decreased in volume by the downward movement oithe inner cylinder to provide a oompressible air cushion for returningthe movable cylinder to its uppermost position and means for maintainingthe desired volume of air in said air chamber, said assembly beingadapted for positioning within a well casing `and its movable cylinderto bew depressed by an increase of pressure within the casing. v

4. In a pump assembly adapted to l'oe positioned in a well casing foroperation byn changesV in pressure therein, the improvement thatcomprises an outer cylinder, an irreversible inlet' to said cylinder, arigid piston secured tov and within said cylinder, a movable smallercylinder with closed upper end slidably mounted around said piston insealed relation to form a closed air chamber within the second cylinder,a piston head secured to the inner cylinder and slidably mounted withinthe larger cylinder and an irreversible outlet through vsaid pistonhead, whereby when the smaller cylinder and associated piston head ismoved downwardly by pressure within the casing the outlet will be openedand the air chamber decreased in volume to compress air therein and whenmoved upwardly by the air compressed inl said air chamber the said inletwill be opened.

l 5. In apump assembly adapted to be positioned insa well casingforoperation by changes in pressure therein, .theV improvement thatcomprises an outer'cylinder, an irreversible inlet' to said cylinder, avrigid piston secured' to vand within said cylinder, a movable smallercylinder with closed upper end slidably mounted around said pistonl insealedv relationA to form a closed air chamber within the secondcylinder, a piston head secured to the inner mounted within the largercylinder, an irreversible Voutlet through said piston head andv meansfor maintaining the desired amount of air in said air chamber. )Y Y 6.In a Vpump assembly adapted to be positioned cylinder and slidably suretherein, the improvement that comprises an outer cylinder, a closure atits lower end, an irreversible inlet through said closure, a piston ofsmaller diameter than said cylinder secured thereto and extendingupwardly therein, a piston head movably mounted within said cylinder, anirreversible outlet therethrough and a second cylinder of smallerdiameter than the rst with closed upper end secured to said piston headand depending therefrom and receiving said piston in reciprocal relationto form a closed air chamber of variable size between the piston and theclosed upper end of the tube to provide a compressible air cushionacting against the piston head.

7. In a pump assembly adapted to be positioned in a well casing foroperation by changes in pressure therein, the improvement that comprisesan outer cylinder, a closure at its lower end, an irreversible inletthrough said closure, a piston of smaller diameter than said cylindersecured thereto and extending upwardly therein, a piston head movablymounted within said cylinder, an irreversible outlet therethrough and asecond cylinder of smaller diameter than the iirst with closed upper endsecured to said piston head and depending therefrom and receiving saidpiston in reciprocal relation to form a closed air chamber of variablesize between the piston and the closed upper end of the tube to providea compressible air cushion acting against the piston head, a tubeleading through said piston to said chamber, and a source of air underpressure connected with said tube.

8. A pump assembly comprising an outer cylinder rigidly mounted Within aWell casing, said outer cylinder being open at its upper end and formedwith an irreversible inlet valve at its lower end, a piston in watertight engagement with and slideable within said outer cylinder, anoutlet port on said piston provided with a one-way valve to permitpassage of liquid toward the upper end of the cylinder, an innercylinder mounted within the outer cylinder, said inner cylinder being ofsubstantially less diameter than the outer cylinder and closed at oneend, a piston in water tight engagement with and slideable within saidinner cylinder, said piston forming a gas chamber between it and theclosed end of the cylinder, and means for maintaining predeterminedpressure in said gas chamber, a movable connection between said gaschamber and the piston in the outer chamber whereby a predominantpressure in the gas chamber will move said piston toward the upper endof the outer cylinder.

9. A pump assembly comprising an outer stationary cylinder, anirreversible inlet at the bottom thereof, an inner cylinder closed atits lower end and rigidly secured at said end to the lower portion ofthe outer cylinder, a piston head secured to the outer cylinder and apiston head secured to the inner cylinder each piston head being insliding sealed relation with its respective cylinder, a rigid connectionbetween said two piston heads, and an irreversible port in the pistonhead on the outer cylinder for passage of liquid upward therethrough,the inner cylinder providing an airtight chamber below its piston headadapted to be decreased in volume by the downward movement of saidpiston to provide a compressed air cushion for returning the piston toits uppermost position when downward pressure against piston head isreleased.

ARNOLD S. SOBERG.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name v Date 436,708 Hearn Sept. 16, 1890 .Y1,961,602 Squires Junev15, 1934

